Cosmological evolution in R^2 gravity

Details Cosmological evolution in R^2 gravity Cosmological evolution in R^2 gravity

2011-12-21

arxiv.org/abs/1112.4995v4

JCAP 02 (2012) 049

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

22 pages, 7 figures. Several references and criticism added. As published in JCAP

Scientific paper

The Universe evolution during the radiation-dominated epoch in the R^2-extended gravity theory is considered. The equations of motion for R and H are solved analytically and numerically. The particle production rate by the oscillating curvature is calculated in one-loop approximation and the back reaction of particle production on the evolution of R is taken into account. Possible implications of the model for cosmological creation of non-thermal dark matter is discussed.

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